gh-135615 List 418 as an exception

Author: sharktide

Doc/library/http.rst

@@ -52,8 +52,7 @@ The :mod:`http` module also defines the following enums that help you work with
 HTTP status codes
 -----------------
 
-Supported HTTP status codes
-available in :class:`http.HTTPStatus` are:
+:class:`http.HTTPStatus supports some `IANA-registered status codes <https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml>`_, as well as 418 (the requested entity is a teapot incapable of brewing coffee)
 
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 Code    Enum Name                           Details